-
427 BCE
Plato
said that atoms are ideal geometric forms -
400 BCE
Democritus
Believed atoms were uniformed. Central figure in the atomic theory. -
500
The Alchemists
The Alchemists believed all metals were formed from 2 principals. These consist of mercury and sulfur. -
Solar System Model
Neils Bohr created the Solar System Model -
Robert Boyle
Believed everything was made of tiny particles -
Antone Lavoisier
he explained that matter is conserved during chemical changes -
Billiard Ball Model
John Dalton created the Billiard Ball Model -
John Dalton
said that all matter is made of invisible atoms -
Amedeo Avogadro
stated that all atoms are reletively the same size -
Dmitri Mendeleev
put elements in order (periodic table) -
JJ Thompson
JJ Thompson discovered the electron -
Pierre and Marie Curie
discovered polonium and radium -
Ernest Rutherford
Discovered that there were 2 types of radiations -
Plum Pudding Model
JJ Thompson created the Plum Pudding Model -
Robert Millikan
discovered the elementary charge of an electron through experiment. -
Neils Bohr
Said "some physical quantities only take discrete values" -
Henry G.J. Moseley
Discovered the Moseley law -xray- -
Albert Einstein
Mathematically proved atoms are real. He also proved liquids are made of molecules. -
Electron Cloud Model
Eruin Schordinger created the Electron Cloud Model -
James Chadwich
James Chadwich discovered neutrons